package excel.poi;


import com.entity.dto.Demo;
import com.entity.dto.Demo1;
import com.entity.dto.Demo2;
import com.handler.BizException;
import com.util.DateUtils;
import excel.CarExcelReq;
import excel.ObjectConverter;
import excel.ReflectUtils;
import excel.file.FileUtil;
import excel.poi.Excel.ColumnType;
import excel.poi.Excel.Type;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.hssf.usermodel.HSSFDataValidation;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.DataValidation;
import org.apache.poi.ss.usermodel.DataValidationConstraint;
import org.apache.poi.ss.usermodel.DataValidationConstraint.OperatorType;
import org.apache.poi.ss.usermodel.DataValidationHelper;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.usermodel.FillPatternType;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.RichTextString;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.ss.util.CellRangeAddressList;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.stream.Collectors;

import static excel.file.FileUtil.TEMP_DIRECTORY_FOR_MAC;

//org.demo.file.FileUtil.TEMP_DIRECTORY_FOR_MAC;

/**
 * Excel相关处理
 */
public class ExcelUtil2<T> {

    /**
     * Excel sheet最大行数，默认65536
     */
    public static final int sheetSize = 65536;
    /**
     * 受Excel约束作用的截止行下标
     */
    private static final int styleEndRow = 65535;
    private static final Logger log = LoggerFactory.getLogger(ExcelUtil2.class);
    /**
     * 数字格式
     */
    private static final DecimalFormat DOUBLE_FORMAT = new DecimalFormat("######0.00");
    /**
     * 必填标识符
     */
    private static final String NOT_EMPTY_FLAG = "*";
    /**
     * 实体对象
     */
    public Class<T> clazz;
    /**
     * 工作表名称
     */
    private String sheetName;
    /**
     * 导出类型（EXPORT:导出数据；IMPORT：导入模板）
     */
    private Type type;
    /**
     * 工作薄对象
     */
    private Workbook wb;
    /**
     * 工作表对象
     */
    private Sheet sheet;
    /**
     * 样式列表
     */
    private Map<String, CellStyle> styles;
    /**
     * 导入导出数据列表
     */
    private List<CarExcelReq> list;
    /**
     * 注解列表
     */
    private List<Object[]> fields;
    /**
     * 统计列表
     */
    private Map<Integer, Double> statistics = new HashMap<Integer, Double>();

    public ExcelUtil2(Class<T> clazz) {
        this.clazz = clazz;
    }

    /**
     * 解析导出值 0=男,1=女,2=未知
     *
     * @param propertyValue 参数值
     * @param converterExp  翻译注解
     * @param separator     分隔符
     *
     * @return 解析后值
     */
    public static String convertByExp(String propertyValue, String converterExp, String separator) {
        StringBuilder propertyString = new StringBuilder();
        String[] convertSource = converterExp.split(",");
        for (String item : convertSource) {
            String[] itemArray = item.split("=");
            if (StringUtils.containsAny(separator, propertyValue)) {
                for (String value : propertyValue.split(separator)) {
                    if (itemArray[0].equals(value)) {
                        propertyString.append(itemArray[1] + separator);
                        break;
                    }
                }
            } else {
                if (itemArray[0].equals(propertyValue)) {
                    return itemArray[1];
                }
            }
        }
        return StringUtils.stripEnd(propertyString.toString(), separator);
    }

    /**
     * 反向解析值 男=0,女=1,未知=2
     *
     * @param propertyValue 参数值
     * @param converterExp  翻译注解
     * @param separator     分隔符
     *
     * @return 解析后值
     */
    public static String reverseByExp(String propertyValue, String converterExp, String separator) {
        StringBuilder propertyString = new StringBuilder();
        String[] convertSource = converterExp.split(",");
        for (String item : convertSource) {
            String[] itemArray = item.split("=");
            if (StringUtils.containsAny(separator, propertyValue)) {
                for (String value : propertyValue.split(separator)) {
                    if (itemArray[1].equals(value)) {
                        propertyString.append(itemArray[0] + separator);
                        break;
                    }
                }
            } else {
                if (itemArray[1].equals(propertyValue)) {
                    return itemArray[0];
                }
            }
        }
        return StringUtils.stripEnd(propertyString.toString(), separator);
    }

    public void init(List<CarExcelReq> list, String sheetName, Type type) {
        if (list == null) {
            list = new ArrayList<CarExcelReq>();
        }
        this.list = list;
        this.sheetName = sheetName;
        this.type = type;
        createExcelField();
        createWorkbook();
    }

    /**
     * 对excel表单默认第一个索引名转换成list
     *
     * @param is 输入流
     *
     * @return 转换后集合
     */
    public List<T> importExcel(InputStream is) {
        return importExcel(StringUtils.EMPTY, is);
    }

    /**
     * 对excel表单指定表格索引名转换成list
     *
     * @param sheetName 表格索引名
     * @param is        输入流
     *
     * @return 转换后集合
     */
    public List<T> importExcel(String sheetName, InputStream is) {
        this.type = Type.IMPORT;
        try {
            this.wb = WorkbookFactory.create(is);
        } catch (Exception e) {
            throw new BizException("文件读取异常");
        }
        List<T> list = new ArrayList<T>();
        Sheet sheet = null;
        if (StringUtils.isNotEmpty(sheetName)) {
            // 如果指定sheet名,则取指定sheet中的内容.
            sheet = wb.getSheet(sheetName);
        } else {
            // 如果传入的sheet名不存在则默认指向第1个sheet.
            sheet = wb.getSheetAt(0);
        }

        if (sheet == null) {
            throw new BizException("文件sheet不存在");
        }

        int rows = sheet.getPhysicalNumberOfRows();

        if (rows > 0) {
            // 定义一个map用于存放excel列的序号和field.
            Map<String, Integer> cellMap = new HashMap<>();
            // 获取表头
            Row heard = sheet.getRow(0);
            for (int i = 0; i < heard.getPhysicalNumberOfCells(); i++) {
                Cell cell = heard.getCell(i);
                if (Objects.nonNull(cell)) {
                    String value = this.getCellValue(heard, i).toString();
                    cellMap.put(value, i);
                } else {
                    cellMap.put(null, i);
                }
            }
            // 有数据时才处理 得到类的所有field.
            Field[] allFields = clazz.getDeclaredFields();
            // 定义一个map用于存放列的序号和field.
            Map<Integer, Field> fieldsMap = new HashMap<>();
            // 必填字段
            Map<Field, String> requiredFieldsMap = new HashMap<>();
            // 字段集合
            for (int col = 0; col < allFields.length; col++) {
                Field field = allFields[col];
                Excel attr = field.getAnnotation(Excel.class);
                if (attr != null && (attr.type() == Type.ALL || attr.type() == type)) {
                    // 设置类的私有字段属性可访问.
                    field.setAccessible(true);
                    String colName = attr.name();
                    // 收集必填列、必填列标题追加必填标识符
                    if (attr.isRequired()) {
                        requiredFieldsMap.put(field, Boolean.TRUE.toString());
                        colName = colName + NOT_EMPTY_FLAG;
                    }
                    // 实际导入列
                    Integer column = cellMap.get(colName);
                    if (column != null) {
                        fieldsMap.put(column, field);
                    }
                }
            }
            for (int i = 1; i < rows; i++) {
                // 从第2行开始取数据,默认第一行是表头.
                Row row = sheet.getRow(i);
                int rowNum = row.getRowNum();
                T entity = null;
                try {
                    entity = clazz.newInstance();
                } catch (Exception e) {
                    throw new BizException("数据导入模型初始化异常");
                }
                for (Map.Entry<Integer, Field> entry : fieldsMap.entrySet()) {
                    int colNum = entry.getKey();
                    // 从map中得到对应列的field.
                    Field field = fieldsMap.get(entry.getKey());
                    Excel attr = field.getAnnotation(Excel.class);
                    Object val = this.getCellValue(row, colNum);

                    //优先解析下拉框选项值
                    if (StringUtils.isNotEmpty(attr.readConverterExp())) {
                        val = reverseByExp(ObjectConverter.toStr(val), attr.readConverterExp(),
                                attr.separator());
                    }

                    // 取得类型,并根据对象类型设置值
                    Class<?> fieldType = field.getType();
                    if (String.class == fieldType) {
                        String s = ObjectConverter.toStr(val);
                        if (StringUtils.endsWith(s, ".0")) {
                            val = StringUtils.substringBefore(s, ".0");
                        } else {
                            val = ObjectConverter.toStr(val);
                        }
                        // 校验字符串长度
                        if (attr.maxLength() > 0
                                && (Objects.nonNull(val) && ((String) val).length() > attr.maxLength())) {
                            StringBuilder sb = new StringBuilder();
                            sb.append("第").append(rowNum + 1).append("行").append(colNum + 1).append("列数据有误,字符个数超过上限值")
                                    .append(attr.maxLength());
                            throw new BizException(sb.toString());
                        }
                    } else if ((Integer.TYPE == fieldType || Integer.class == fieldType)
                            && StringUtils.isNumeric(ObjectConverter.toStr(val))) {
                        val = ObjectConverter.toInt(val);
                    } else if (Long.TYPE == fieldType || Long.class == fieldType) {
                        val = ObjectConverter.toLong(val);
                    } else if (Double.TYPE == fieldType || Double.class == fieldType) {
                        val = ObjectConverter.toDouble(val);
                    } else if (Float.TYPE == fieldType || Float.class == fieldType) {
                        val = ObjectConverter.toFloat(val);
                    } else if (BigDecimal.class == fieldType) {
                        val = ObjectConverter.toBigDecimal(val);
                    } else if (Date.class == fieldType) {
                        if (val instanceof String) {
                            val = DateUtils.parseDate(val);
                        } else if (val instanceof Double) {
                            val = DateUtil.getJavaDate((Double) val);
                        }
                    }

                    // 必填校验
                    if (Boolean.valueOf(requiredFieldsMap.get(field)) &&
                            (val == null || StringUtils.isEmpty(val.toString()))) {
                        StringBuilder sb = new StringBuilder();
                        sb.append("第").append(rowNum + 1).append("行").append(colNum + 1).append("列数据有误,请填写必填项");
                        throw new BizException(sb.toString());
                    }

                    //属性赋值
                    String propertyName = field.getName();
                    if (StringUtils.isNotEmpty(attr.targetAttr())) {
                        propertyName = field.getName() + "." + attr.targetAttr();
                    }

                    ReflectUtils.invokeSetter(entity, propertyName, val);
                }
                list.add(entity);
            }
        }
        return list;
    }

    /**
     * 对list数据源将其里面的数据导入到excel表单
     *
     * @param list      导出数据集合
     * @param sheetName 工作表的名称
     *
     * @return 文件名
     */
    public String exportExcel(List<CarExcelReq> list, String sheetName) {
        this.init(list, sheetName, Type.EXPORT);
        return exportExcel();
    }

    /**
     * 对list数据源将其里面的数据导入到excel表单
     *
     * @param sheetName 工作表的名称
     *
     * @return 文件名
     */
    public String importTemplateExcel(String sheetName) {
        this.init(null, sheetName, Type.IMPORT);
        return exportExcel();
    }

    /**
     * 对list数据源将其里面的数据导入到excel表单
     *
     * @return 文件名
     */
    public String exportExcel() {
        OutputStream out = null;
        try {
            // 取出一共有多少个sheet.
            double sheetNo = Math.ceil(list.size() / sheetSize);
            for (int index = 0; index <= sheetNo; index++) {
                createSheet(sheetNo, index);

                // 产生一行
                Row row = sheet.createRow(0);
                int column = 0;
                // 写入各个字段的列头名称
                for (Object[] os : fields) {
                    Excel excel = (Excel) os[1];
                    this.createCell(excel, row, column++);
                }
                if (Type.EXPORT.equals(type)) {
                    fillExcelData(index, row);
                    addStatisticsRow();
                }
            }
            String filename = encodingFilename(sheetName);
            out = new FileOutputStream(getAbsoluteFile(filename));
            wb.write(out);
            return filename;
        } catch (Exception e) {
            log.error("导出Excel异常{}", e.getMessage());
            throw new BizException("导出Excel失败，请联系网站管理员！");
        } finally {
            if (wb != null) {
                try {
                    wb.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
        }
    }

    /**
     * 填充excel数据
     *
     * @param index 序号
     * @param row   单元格行
     */
    public void fillExcelData(int index, Row row) {

        int[] length = {0,1,2};

        int[] length2 = {3,4,5,6};
//        int startNo = index * sheetSize;
//        int endNo = Math.min(startNo + sheetSize, list.size());
        int indexStart = 0;

        int endIndex = 1;
        int startIndex = 1;
        int endIndex2 = 1;
        int startIndex2 = 1;
        for (int i2 = 0; i2 < list.size(); i2++) {
            CarExcelReq carExcelReq = list.get(i2);
            // 合并单元格

            List<Demo> demoList = carExcelReq.getDemoList();
            for (int i = 0; i < demoList.size(); i++) {

                Demo demo = demoList.get(i);
                List<Demo2> demo2List = demo.getDemo2List();
                for (int i1 = 0; i1 < demo2List.size(); i1++) {
                    Demo2 demo2 = demo2List.get(i1);
                    ++indexStart;
                    row = sheet.createRow(indexStart);
                    int column = 0;
                    for (Object[] os : fields) {
                        Field field = (Field) os[0];
                        Excel excel = (Excel) os[1];
                        // 设置实体类私有属性可访问
                        field.setAccessible(true);
                        this.addCell(excel, row, carExcelReq, field, column++, i, i1);
                    }
                }
                endIndex2 = indexStart;

                for (int j = 0; j < length2.length; j++) {
                    CellRangeAddress ran = new CellRangeAddress(startIndex2, endIndex2, length2[j], length2[j]);
                    sheet.addMergedRegion(ran);
                }
                startIndex2 = indexStart+1;

            }
            endIndex = indexStart;
            for (int i = 0; i < length.length; i++) {
                CellRangeAddress ran = new CellRangeAddress(startIndex, endIndex, length[i], length[i]);
                sheet.addMergedRegion(ran);

            }
            startIndex = indexStart+1;

        }

//        for (int i = startNo; i < endNo; i++) {
//            row = sheet.createRow(i + 1 - startNo);
//            // 得到导出对象.
//            T vo = (T) list.get(i);
//            int column = 0;
//            for (Object[] os : fields) {
//                Field field = (Field) os[0];
//                Excel excel = (Excel) os[1];
//                // 设置实体类私有属性可访问
//                field.setAccessible(true);
//                this.addCell(excel, row, vo, field, column++);
//            }
//        }
    }

    /**
     * 创建表格样式
     *
     * @param wb 工作薄对象
     *
     * @return 样式列表
     */
    private Map<String, CellStyle> createStyles(Workbook wb) {
        // 写入各条记录,每条记录对应excel表中的一行
        Map<String, CellStyle> styles = new HashMap<String, CellStyle>();
        CellStyle style = wb.createCellStyle();
        style.setAlignment(HorizontalAlignment.CENTER);
        style.setVerticalAlignment(VerticalAlignment.CENTER);
        style.setBorderRight(BorderStyle.THIN);
        style.setRightBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
        style.setBorderLeft(BorderStyle.THIN);
        style.setLeftBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
        style.setBorderTop(BorderStyle.THIN);
        style.setTopBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
        style.setBorderBottom(BorderStyle.THIN);
        style.setBottomBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
        Font dataFont = wb.createFont();
        dataFont.setFontName("Arial");
        dataFont.setFontHeightInPoints((short) 10);
        style.setFont(dataFont);
        styles.put("data", style);

        style = wb.createCellStyle();
        style.cloneStyleFrom(styles.get("data"));
        style.setAlignment(HorizontalAlignment.CENTER);
        style.setVerticalAlignment(VerticalAlignment.CENTER);
        style.setFillForegroundColor(IndexedColors.GREY_50_PERCENT.getIndex());
        style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
        Font headerFont = wb.createFont();
        headerFont.setFontName("Arial");
        headerFont.setFontHeightInPoints((short) 10);
        headerFont.setBold(true);
        headerFont.setColor(IndexedColors.WHITE.getIndex());
        style.setFont(headerFont);
        styles.put("header", style);

        style = wb.createCellStyle();
        style.setAlignment(HorizontalAlignment.CENTER);
        style.setVerticalAlignment(VerticalAlignment.CENTER);
        Font totalFont = wb.createFont();
        totalFont.setFontName("Arial");
        totalFont.setFontHeightInPoints((short) 10);
        style.setFont(totalFont);
        styles.put("total", style);

        return styles;
    }

    /**
     * 创建单元格
     */
    public Cell createCell(Excel attr, Row row, int column) {
        // 创建列
        Cell cell = row.createCell(column);
        String title = attr.name();
        cell.setCellValue(title);
        // 写入列信息
        if (attr.isRequired()) {
            cell.setCellValue(title + NOT_EMPTY_FLAG);
            RichTextString richTextString = cell.getRichStringCellValue();
            Font font = wb.createFont();
            font.setColor(IndexedColors.RED.getIndex());
            richTextString.applyFont(title.length(), title.length() + 1, font);
        }
        cell.setCellStyle(styles.get("header"));
        setDataValidation(attr, row, column);
        return cell;
    }

    /**
     * 设置单元格信息
     *
     * @param value 单元格值
     * @param attr  注解相关
     * @param cell  单元格信息
     */
    public void setCellVo(Object value, Excel attr, Cell cell) {
        if (ColumnType.STRING == attr.cellType()) {
            cell.setCellType(CellType.STRING);
            cell.setCellValue(Objects.isNull(value) ? attr.defaultValue() : value + attr.suffix());
        } else if (ColumnType.NUMERIC == attr.cellType()) {
            cell.setCellType(CellType.NUMERIC);
            cell.setCellValue(
                    StringUtils.contains(ObjectConverter.toStr(value), ".") ? ObjectConverter.toDouble(value)
                            : ObjectConverter
                            .toInt(value));
        }
    }

    /**
     * 创建表格样式
     */
    public void setDataValidation(Excel attr, Row row, int column) {

        if (attr.name().indexOf("注：") >= 0) {
            sheet.setColumnWidth(column, 6000);
        } else {
            // 设置列宽
            sheet.setColumnWidth(column, (int) ((attr.width() + 0.72) * 256));
            row.setHeight((short) (attr.height() * 20));
        }
        // 如果设置了提示信息则鼠标放上去提示.
        if (StringUtils.isNotEmpty(attr.prompt())) {
            addPromptConstraint(sheet, "", attr.prompt(), 1, styleEndRow, column, column);
        }
        // 如果设置了combo属性则本列只能选择不能输入
        if (attr.combo().length > 0) {
            addDropDownConstraint(sheet, attr.combo(), 1, styleEndRow, column, column);
        }
        // 设置单元格字段长度上限
        if (attr.maxLength() > 0) {
            addTextLengthConstraint(sheet, attr.maxLength(), attr.isRequired(), 1, styleEndRow, column, column);
        }
    }

    /**
     * 添加单元格
     */
    public Cell addCell(Excel attr, Row row, CarExcelReq vo, Field field, int column,int i,int i1) {
        Cell cell = null;
        try {
            // 设置行高
            row.setHeight((short) (attr.height() * 20));
            // 根据Excel中设置情况决定是否导出,有些情况需要保持为空,希望用户填写这一列.
            if (attr.isExport()) {
                // 创建cell
                cell = row.createCell(column);
                cell.setCellStyle(styles.get("data"));

                // 用于读取对象中的属性
                Object value = getTargetValue(vo, field, attr,i,i1);
                String dateFormat = attr.dateFormat();
                String readConverterExp = attr.readConverterExp();
                String separator = attr.separator();
                if (StringUtils.isNotEmpty(dateFormat) && Objects.nonNull(value)) {
                    cell.setCellValue(new SimpleDateFormat(dateFormat).format((Date) value));
                } else if (StringUtils.isNotEmpty(readConverterExp) && Objects.nonNull(value)) {
                    cell.setCellValue(convertByExp(ObjectConverter.toStr(value), readConverterExp, separator));
                } else if (value instanceof BigDecimal && -1 != attr.scale()) {
                    cell.setCellValue((((BigDecimal) value).setScale(attr.scale(), attr.roundingMode())).toString());
                } else {
                    // 设置列类型
                    setCellVo(value, attr, cell);
                }
                addStatisticsData(column, ObjectConverter.toStr(value), attr);
            }
        } catch (Exception e) {
            log.error("导出Excel失败{}", e);
        }
        return cell;
    }

    /**
     * 设置单元格提示
     *
     * @param sheet         表单
     * @param promptTitle   提示标题
     * @param promptContent 提示内容
     * @param firstRow      开始行
     * @param endRow        结束行
     * @param firstCol      开始列
     * @param endCol        结束列
     */
    public void addPromptConstraint(Sheet sheet, String promptTitle, String promptContent, int firstRow, int endRow,
                                    int firstCol, int endCol) {
        DataValidationHelper helper = sheet.getDataValidationHelper();
        DataValidationConstraint constraint = helper.createCustomConstraint("DD1");
        CellRangeAddressList regions = new CellRangeAddressList(firstRow, endRow, firstCol, endCol);
        DataValidation dataValidation = helper.createValidation(constraint, regions);
        dataValidation.createPromptBox(promptTitle, promptContent);
        dataValidation.setShowPromptBox(true);
        sheet.addValidationData(dataValidation);
    }

    /**
     * 设置单元格字段长度上限
     *
     * @param sheet     表单
     * @param maxLength 字段长度
     * @param firstRow  开始行
     * @param endRow    结束行
     * @param firstCol  开始列
     * @param endCol    结束列
     */
    public void addTextLengthConstraint(Sheet sheet, Integer maxLength, boolean required, int firstRow, int endRow,
                                        int firstCol, int endCol) {
        DataValidationHelper helper = sheet.getDataValidationHelper();
        DataValidationConstraint constraint = helper
                .createTextLengthConstraint(OperatorType.LESS_OR_EQUAL, maxLength.toString(), null);
        StringBuilder sb = new StringBuilder();
        if (required) {
            sb.append("必填项，");
        }
        sb.append("最多输入").append(maxLength).append("个字符");
        CellRangeAddressList regions = new CellRangeAddressList(firstRow, endRow, firstCol, endCol);
        DataValidation dataValidation = helper.createValidation(constraint, regions);
        dataValidation.createPromptBox("", sb.toString());
        dataValidation.setShowPromptBox(true);
        sheet.addValidationData(dataValidation);
    }

    /**
     * 设置下拉框选项.
     *
     * @param sheet    要设置的sheet.
     * @param textList 下拉框显示的内容
     * @param firstRow 开始行
     * @param endRow   结束行
     * @param firstCol 开始列
     * @param endCol   结束列
     *
     * @return 设置好的sheet.
     */
    public void addDropDownConstraint(Sheet sheet, String[] textList, int firstRow, int endRow, int firstCol,
                                      int endCol) {
        DataValidationHelper helper = sheet.getDataValidationHelper();
        // 加载下拉列表内容
        DataValidationConstraint constraint = helper.createExplicitListConstraint(textList);
        // 设置数据有效性加载在哪个单元格上,四个参数分别是：起始行、终止行、起始列、终止列
        CellRangeAddressList regions = new CellRangeAddressList(firstRow, endRow, firstCol, endCol);
        // 数据有效性对象
        DataValidation dataValidation = helper.createValidation(constraint, regions);
        // 处理Excel兼容性问题
        dataValidation.setSuppressDropDownArrow(false);
        if (dataValidation instanceof HSSFDataValidation) {
            dataValidation.setShowErrorBox(true);
        }

        sheet.addValidationData(dataValidation);
    }

    /**
     * 合计统计信息
     */
    private void addStatisticsData(Integer index, String text, Excel entity) {
        if (entity != null && entity.isStatistics()) {
            Double temp = 0D;
            if (!statistics.containsKey(index)) {
                statistics.put(index, temp);
            }
            try {
                temp = Double.valueOf(text);
            } catch (NumberFormatException e) {
            }
            statistics.put(index, statistics.get(index) + temp);
        }
    }

    /**
     * 创建统计行
     */
    public void addStatisticsRow() {
        if (statistics.size() > 0) {
            Cell cell = null;
            Row row = sheet.createRow(sheet.getLastRowNum() + 1);
            Set<Integer> keys = statistics.keySet();
            cell = row.createCell(0);
            cell.setCellStyle(styles.get("total"));
            cell.setCellValue("合计");

            for (Integer key : keys) {
                cell = row.createCell(key);
                cell.setCellStyle(styles.get("total"));
                cell.setCellValue(DOUBLE_FORMAT.format(statistics.get(key)));
            }
            statistics.clear();
        }
    }

    /**
     * 编码文件名
     */
    public String encodingFilename(String filename) {
        filename = filename + ".xls";
        return filename;
    }

    /**
     * 获取下载路径
     *
     * @param filename 文件名称
     */
    public String getAbsoluteFile(String filename) {
        String downloadPath = FileUtil.TEMP_DIRECTORY + filename;
        if (System.getProperties().getProperty("os.name").startsWith("Mac")){
            downloadPath = TEMP_DIRECTORY_FOR_MAC + filename;
        }
        File desc = new File(downloadPath);
        if (!desc.getParentFile().exists()) {
            desc.getParentFile().mkdirs();
        }
        return downloadPath;
    }

    /**
     * 获取bean中的属性值
     *
     * @param vo    实体对象
     * @param field 字段
     * @param excel 注解
     *
     * @return 最终的属性值
     */
    private Object getTargetValue(CarExcelReq vo, Field field, Excel excel,int i,int i1) throws Exception {
        Object o = field.get(vo);
        if (StringUtils.isNotEmpty(excel.targetAttr())) {
            String target = excel.targetAttr();
            if (target.indexOf(".") > -1) {
                String[] targets = target.split("[.]");
                for (String name : targets) {

//                    o = getValue(o, name);
                    o = getValue2(vo,field,excel,i,i1, name);
                }
            } else {
//                o = getValue(o, target);
                o = getValue2(vo,field,excel,i,i1, target);
            }
        }
        return o;
    }

    /**
     * 以类的属性的get方法方法形式获取值
     *
     * @param o
     * @param name
     *
     * @return value
     *
     * @throws Exception
     */
    private Object getValue(Object o, String name) throws Exception {
        if (StringUtils.isNotEmpty(name)) {
            Class<?> clazz = o.getClass();
            Field field = clazz.getDeclaredField(name);
            field.setAccessible(true);
            o = field.get(o);
        }
        return o;
    }
    /**
     * 以类的属性的get方法方法形式获取值
     *
     * @param
     * @param name
     *
     * @return value
     *
     * @throws Exception
     */
    private Object getValue2(CarExcelReq vo, Field field, Excel excel,int i,int i1, String name) throws Exception {
        Object o = null;
        if (StringUtils.isNotEmpty(name)) {
            if (name.equals("Demo")) {
                Demo demo = vo.getDemoList().get(i);
                Field[] declaredFields = Demo.class.getDeclaredFields();
                for (Field declaredField : declaredFields) {
                    declaredField.setAccessible(true);
                    if (declaredField.getName().equals(field.getName())) {
                         o = declaredField.get(demo);
                         break;
                    }

                }
            }
            if (name.equals("Demo1")) {
                Demo1 demo1 = vo.getDemoList().get(i).getDemo1();
                Field[] declaredFields = Demo1.class.getDeclaredFields();
                for (Field declaredField : declaredFields) {
                    declaredField.setAccessible(true);
                    if (declaredField.getName().equals(field.getName())) {
                        o = declaredField.get(demo1);
                        break;
                    }

                }

            }
            if (name.equals("Demo2")) {
                Demo2 demo2 = vo.getDemoList().get(i).getDemo2List().get(i1);
                Field[] declaredFields = Demo2.class.getDeclaredFields();
                for (Field declaredField : declaredFields) {
                    declaredField.setAccessible(true);
                    if (declaredField.getName().equals(field.getName())) {
                        o = declaredField.get(demo2);
                        break;
                    }

                }
            }
//            Class<?> clazz = o.getClass();
//            Field field = clazz.getDeclaredField(name);
//            field.setAccessible(true);
            return o;

        }
        return null;
    }

    /**
     * 得到所有定义字段
     */
    private void createExcelField() {
        this.fields = new ArrayList<Object[]>();
        List<Field> tempFields = new ArrayList<>();
        tempFields.addAll(Arrays.asList(clazz.getSuperclass().getDeclaredFields()));
        tempFields.addAll(Arrays.asList(clazz.getDeclaredFields()));
        for (Field field : tempFields) {
            // 单注解
            if (field.isAnnotationPresent(Excel.class)) {
                putToField(field, field.getAnnotation(Excel.class));
            }

            // 多注解
            if (field.isAnnotationPresent(Excels.class)) {
                Excels attrs = field.getAnnotation(Excels.class);
                Excel[] excels = attrs.value();
                for (Excel excel : excels) {
                    putToField(field, excel);
                }
            }
        }
        this.fields = this.fields.stream().sorted(Comparator.comparing(objects -> ((Excel) objects[1]).sort()))
                .collect(Collectors.toList());
    }

    /**
     * 放到字段集合中
     */
    private void putToField(Field field, Excel attr) {
        if (attr != null && (attr.type() == Type.ALL || attr.type() == type)) {
            this.fields.add(new Object[]{field, attr});
        }
    }

    /**
     * 创建一个工作簿
     */
    public void createWorkbook() {
        this.wb = new HSSFWorkbook();
    }

    /**
     * 创建工作表
     *
     * @param sheetNo sheet数量
     * @param index   序号
     */
    public void createSheet(double sheetNo, int index) {
        this.sheet = wb.createSheet();
        this.styles = createStyles(wb);
        // 设置工作表的名称.
        if (sheetNo == 0) {
            wb.setSheetName(index, sheetName);
        } else {
            wb.setSheetName(index, sheetName + index);
        }
    }

    /**
     * 获取单元格值
     *
     * @param row    获取的行
     * @param column 获取单元格列号
     *
     * @return 单元格值
     */
    public Object getCellValue(Row row, int column) {
        if (row == null) {
            return row;
        }
        Object val = "";
        try {
            Cell cell = row.getCell(column);
            if (Objects.nonNull(cell)) {
                if (cell.getCellTypeEnum() == CellType.NUMERIC || cell.getCellTypeEnum() == CellType.FORMULA) {
                    val = cell.getNumericCellValue();
                    if (HSSFDateUtil.isCellDateFormatted(cell)) {
                        val = DateUtil.getJavaDate((Double) val); // POI Excel 日期格式转换
                    } else {
                        if ((Double) val % 1 > 0) {
                            val = new BigDecimal(val.toString());
                        } else {
                            val = new DecimalFormat("0").format(val);
                        }
                    }
                } else if (cell.getCellTypeEnum() == CellType.STRING) {
                    val = cell.getStringCellValue();
                } else if (cell.getCellTypeEnum() == CellType.BOOLEAN) {
                    val = cell.getBooleanCellValue();
                } else if (cell.getCellTypeEnum() == CellType.ERROR) {
                    val = cell.getErrorCellValue();
                }

            }
        } catch (Exception e) {
            return val;
        }
        return val;
    }
}
